<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>列表过滤</title>
    <script src="/js/vue-2.7.9-dev.js"></script>
    <style>
    </style>
</head>
<body>
    <div id="app">
        <h2>人员列表</h2>
        <input type="text" placeholder="请输入名字" v-model="keyWord">
        <ul>
            <li v-for="(p,index) of newPersons" :key="p.id">
                {{ p.name }}-{{ p.age }}-{{ p.sex }}
            </li>
        </ul>
    </div>

    <script>
        Vue.config.productionTip = false
        // 用 watch 实现
        // #region 
        /* new Vue({
                    el: '#root',
                    data: {
                        keyWord: '',
                        persons: [
                            { id: '001', name: '马冬梅', age: 19, sex: '女' },
                            { id: '002', name: '周冬雨', age: 20, sex: '女' },
                            { id: '003', name: '周杰伦', age: 21, sex: '男' },
                            { id: '004', name: '温兆伦', age: 22, sex: '男' }
                        ],
                        filPersons: []
                    },
                    watch: {
                        keyWord: {
                            immediate: true,
                            handler(val) {
                                this.filPersons = this.persons.filter((p) => {
                                    return p.name.indexOf(val) !== -1
                                })
                            }
                        }
                    }
                }) */
        //#endregion

        // 用 computed 实现
        new Vue({
            el: '#app',
            data: {
                keyWord: '',
                persons: [
                    { id: '001', name: '马冬梅', age: 19, sex: '女' },
                    { id: '002', name: '周冬雨', age: 20, sex: '女' },
                    { id: '003', name: '周杰伦', age: 21, sex: '男' },
                    { id: '004', name: '温兆伦', age: 22, sex: '男' }
                ]
            },
            // watch: {
            //     keyWord() {
            //         this.persons = this.persons.filter((item) => {
            //             return item.name.indexOf(this.keyWord) !== -1
            //         })
            //     }
            // },
            computed:{
                newPersons(){
                    return this.persons.filter((item) => {
                        return item.name.indexOf(this.keyWord) !== -1
                    })
                }
            }
        }) 
    </script>
</body>
</html>